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Texas Instruments LMC7221AIMX/NOPB
- Part No.:
- LMC7221AIMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC7221AIMX/NOPB.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,650
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Product details
Overview
LMC7221AIMX/NOPB from Texas Instruments is a micropower CMOS comparator with rail-to-rail input, open-drain output, 5 mV max input offset voltage, 7 μA typical supply current at 5V, and 4 μs propagation delay (tPHL/tPLH) at 5V - deployed in battery-powered mixed-voltage systems for precision threshold detection.
For engineers reviewing the LMC7221AIMX/NOPB datasheet, LMC7221AIMX/NOPB pinout, LMC7221AIMX/NOPB application, or LMC7221AIMX/NOPB equivalent, key selection criteria include its 2.7–15V supply range, sub-picoampere input bias current, −40°C to +85°C operating temperature, SOT-23/ SOIC package options, and open-drain compatibility with level-shifted logic interfaces.
Technical Context
The LMC7221AIMX/NOPB implements a CMOS input stage with rail-to-rail common-mode input range extending 200 mV beyond V− and V+, enabling direct sensing near supply rails without external biasing. Its open-drain output supports pull-up to voltages up to 15V, independent of the comparator's own supply.
It delivers 100 dB voltage gain and >75 dB CMRR across 2.7–15V supplies, with input offset voltage drift limited to 1.0 μV/°C (5V) and 4.0 μV/°C (15V). The device is characterized for single-supply operation and features built-in ESD protection per HBM (2 kV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 15V - supports wide battery discharge profiles and mixed-voltage system interfacing. |
| Input Offset Voltage (max) | 5 mV - ensures accurate threshold detection in low-overdrive sensor monitoring applications. |
| Supply Current (typ) | 7 μA at 5V - enables multi-year operation on coin-cell batteries in portable security or alarm circuits. |
| Propagation Delay | 4 μs (tPHL/tPLH) at 5V, 100 mV overdrive - suitable for medium-speed window comparators and zero-crossing detection. |
| Input Common-Mode Range | Extends 200 mV beyond V− and V+ - eliminates need for input voltage dividers in power-supply monitoring. |
| Output Type | Open-drain - allows flexible logic-level translation via external pull-up to 3.3V, 5V, or 15V rails. |
| Input Bias Current | 0.04 pA typ - preserves signal integrity when interfacing high-impedance sensors or RC timing networks. |
Pinout & Package
LMC7221AIMX/NOPB is supplied in an 8-pin SOIC package (Package Drawing D), 3.91 mm × 4.90 mm footprint, 1.75 mm height, RoHS-compliant with Sn finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Open-drain output | Sinks current only; requires external pull-up resistor for logic-high assertion - enables voltage-level translation. |
| 2 (−IN) | Inverting input | High-impedance CMOS node accepting signals from −0.3V to V+ + 0.3V - supports rail-to-rail analog inputs. |
| 3 (+IN) | Non-inverting input | Identical input specification as Pin 2; differential pair enables precise threshold comparison. |
| 4 (GND) | Negative supply / reference ground | Return path for supply and signal references; must be low-impedance to maintain input common-mode accuracy. |
| 5 (NC) | No connect | Internally unconnected; no electrical function - must remain floating or grounded per layout best practices. |
| 6 (V+) | Positive supply | Accepts 2.7–15V DC; powers internal circuitry and defines upper common-mode limit. |
| 7 (NC) | No connect | Internally unconnected; no electrical function - must remain floating or grounded per layout best practices. |
| 8 (NC) | No connect | Internally unconnected; no electrical function - must remain floating or grounded per layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Operates with inputs 200 mV beyond V− and V+, enabling direct monitoring of supply rails or current-sense resistors. |
| Ultra-low input bias current | 0.04 pA typical - minimizes loading error on high-Z sources like piezoelectric sensors or long RC timing networks. |
| Open-drain output architecture | Supports pull-up to any voltage ≤15V, decoupling logic interface voltage from comparator supply - critical for mixed-voltage PCBs. |
| Micropower operation | 7 μA supply current at 5V - extends battery life in always-on alarm, PDA, or PCMCIA card applications. |
| Wide supply voltage support | Specified from 2.7V to 15V - accommodates single-cell Li-ion (3.0–4.2V), dual-cell alkaline (2.4–3.2V), and industrial 12V rails. |
Applications
| Battery Voltage Monitor | Mixed-Voltage Logic Interface |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charge/discharge cycles in portable medical devices. IC Role / Device Role / Timing Role: Comparator compares sensed battery voltage against a precision reference to trigger low-battery alerts. Use Value: Rail-to-rail input allows direct connection to battery terminals; micropower draw avoids parasitic drain during standby. |
Use Scenario: Interfacing a 5V microcontroller GPIO to a 3.3V FPGA I/O bank requiring level-shifted interrupt signaling. IC Role / Device Role / Timing Role: LMC7221AIMX/NOPB detects voltage thresholds on the 5V side and asserts open-drain output pulled to 3.3V. Use Value: Eliminates discrete level-shifter ICs; open-drain output ensures safe, bidirectional voltage translation without shoot-through risk. |
| Zero-Crossing Detector | Direct Sensor Threshold Detection |
|
Use Scenario: AC line zero-crossing detection in smart energy meters using a resistive divider from 230VAC mains. IC Role / Device Role / Timing Role: Compares scaled AC waveform against ground reference to generate clean digital zero-cross pulses. Use Value: Input common-mode range extending below ground (−0.3V) enables reliable detection even with large input resistors and minimal phase shift. |
Use Scenario: Detecting motion via piezoelectric vibration sensor output exceeding 50 mV threshold in industrial predictive maintenance nodes. IC Role / Device Role / Timing Role: Compares high-impedance sensor output directly against a stable reference without amplification. Use Value: Sub-picoampere input bias prevents signal attenuation; rail-to-rail input accepts small signals near ground or V+. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC7221AIM5/NOPB | Same die, 5-pin SOT-23 package (DBV); 3.05 mm × 3.00 mm footprint; 1.43 mm max height. | Preferred for ultra-compact layouts where board area or profile is constrained (e.g., PCMCIA cards, wearables). | Select LMC7221AIM5/NOPB when space or thickness limits preclude SOIC; verify thermal dissipation (θJA = 325°C/W) in high-ambient environments. |
| TLV3011IDBVR | Lower supply current (550 nA typ), but higher offset (6.5 mV max), slower response (12 μs), and no guaranteed rail-to-rail input at 2.7V. | Better suited for ultra-low-power wake-up circuits where speed and precision are secondary to current draw. | Choose TLV3011IDBVR only if sub-μA quiescent current is mandatory and 4 μs response is not required; confirm input range meets design margin. |
Compared with LMC7221AIMX/NOPB, the SOT-23 variant offers identical electrical performance in a smaller footprint but higher thermal resistance, while TLV3011IDBVR trades speed and input range for nanoamp-level supply current - making each optimal for distinct power/space/performance trade-offs.
Availability
LMC7221AIMX/NOPB is available at Aetrix Electronics and suitable for battery-powered notebooks, PCMCIA cards, and alarm/security circuits requiring stable component supply across extended production lifecycles.
Supply support for LMC7221AIMX/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and low-power design.
The LMC7221AIMX/NOPB belongs to TI's Tiny Comparator family, engineered for space-constrained, battery-operated systems requiring rail-to-rail input, open-drain flexibility, and micropower efficiency - targeting portable instrumentation and mixed-voltage interface applications.
FAQ
What is the maximum supply voltage rating for the LMC7221AIMX/NOPB?
The LMC7221AIMX/NOPB has an absolute maximum supply voltage (V+ – V−) of 16V, with recommended operating range from 2.7V to 15V. Exceeding 16V risks permanent damage. The device is fully specified and tested at 2.7V, 5V, and 15V, ensuring consistent performance across this span. Always observe derating guidelines for reliability at elevated temperatures.
Does the LMC7221AIMX/NOPB support true rail-to-rail input operation?
Yes, the LMC7221AIMX/NOPB supports rail-to-rail input with common-mode voltage range extending 200 mV beyond both V− and V+ - confirmed as −0.3V to V+ + 0.3V across all supply voltages. This allows direct sensing of signals at or slightly outside supply rails, eliminating level-shifting components in applications like power-supply monitoring or current-sense amplification.
Can the LMC7221AIMX/NOPB drive an LED directly?
Yes, the LMC7221AIMX/NOPB can sink up to 5 mA (typical) with VOL ≤ 0.4 V at 5V supply, sufficient to drive low-current indicator LEDs. Its open-drain output requires an external current-limiting resistor between the LED anode and a positive rail (e.g., 3.3V or 5V). Ensure total sink current remains within 5 mA to maintain output low voltage and avoid exceeding SOIC thermal limits.
What is the input offset voltage specification for the LMC7221AIMX/NOPB?
The LMC7221AIMX/NOPB is the AI-grade variant with a maximum input offset voltage of 5 mV at 25°C (ensured limit), and 8 mV across the full −40°C to +85°C temperature range. Typical offset is 3 mV. This grade provides tighter matching than the BI variant (15 mV max), making it preferred for precision threshold detection in sensor interfaces and battery monitors where accuracy is critical.
Is the LMC7221AIMX/NOPB pin-compatible with other comparators in TI's Tiny family?
No, the LMC7221AIMX/NOPB (8-pin SOIC) is not pin-compatible with dual or push-pull variants like LMC6762 or LMC7211. Its Pin 5, 7, and 8 are NC, differing from functional pinouts of other comparators. For drop-in replacement, only LMC7221AIM/NOPB (same SOIC package, same pinout) is electrically and mechanically identical - confirm marking and grade before substitution.
LMC7221AIMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- Open-Drain
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 15V, ±1.35V ~ 7.5V
- :
- 5mV @ 5V
- Voltage - Input Offset (Max):
- 0.04pA @ 5V
- Current - Input Bias (Max):
- 30mA
- Current - Output (Typ):
- 14µA
- Current - Quiescent (Max):
- 75dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 10µs
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LMC7221AIMX/NOPB FAQ
1.How can I place an order for LMC7221AIMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC7221AIMX/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMC7221AIMX/NOPB reliable?
The price and inventory of LMC7221AIMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC7221AIMX/NOPB is usually 5 days.
3.What payment methods are accepted for LMC7221AIMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC7221AIMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC7221AIMX/NOPB?
LMC7221AIMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC7221AIMX/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMC7221AIMX/NOPB?
For technical support, including LMC7221AIMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC7221AIMX/NOPB requirements.
6.How does Aetrix verify that LMC7221AIMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC7221AIMX/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMC7221AIMX/NOPB meets industry standards.
7.What is the process for return or replacement of LMC7221AIMX/NOPB?
All LMC7221AIMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC7221AIMX/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMC7221AIMX/NOPB part is unused and in its original packaging.
Return procedure for LMC7221AIMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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